Actuating means for twin master cylinders



Fild oat. 25. 1941 IINVE'NTOR ATTORNEY struct an actuating means of the l connection with of different actu ation wp waw My invention relates that e'qu al fo rceswill be applied t tn pistons or 1 like} members of the two, master cylinder devices.

1 Another object of invention is ,to seem- I, One'of the objectsof myyinventionisto pro lkind r ferre to p vide improved actuating meanswhich will insure ameter substantially the same as the cross bore ,bore. The end portions that it will be a unitary assembly, completely sealed for lubrication purposes, economically constructed and eflicientin operatioh. i

parent fro m the which Figure Lisa partial sectional view showing Wan actuating means for two master cylinder dew my invention is embodied; and" vices fin; which A Figure 2 is a sectional view of-"a modified construction.

Referring to F gure rm detail, I indicates the Y twin master cylinders iniwhichis embodied paral- 1 lel cylinders 2 and recipr'ocable movementthe pistonsfl and 5.

jIfhese pistons are adapted tocompressfluid in the cylinders and following description taken in the accompanying. drawing in 3 havingrno unted therein for force itoutj throughthe foutlet '21 curved as shown. The

-- PATENT OFFICE,

Smmwmmsme Mo), assignor tewagner Louis, M0,, a 'corpo- Application"Qctober25, 1941, Serial No. 415,430 r A in J {LL19 cla ms, (or, 74 -116)? g toimastercylinderfdevices employ'edin fluid pressurelactuated systems and more particularly to actuating means'for moving gth'e pistons of twinmastencylinders.

pf sleeve whim qs n e in the bore u is providedwithaslo z p n I p Within the'flhousing is airfeqduz ng parzz which lie in the endsoi sleeves l8 and I9 are of i flat formatio'n and extendthroughslots 20 and The edges of these flat end portions are forward edge of end 24 Other objects of my invention l1 become;#p- 3 {i p ed u t e end Y pistonrod 26 sleeve and into the socket- 2l in the rear end of conduits s and 1 whichjlead tolthe fluid motors ample, brake operating fluidjhotorsn Thepistons are shown in their retracted ;.positior is determined by the stop plate 8 atfthe rear met; the

that these pistons, which; a

,cylinders- It is desirable equal forces are applied =comprises-a housing member I!) having parallel boresull ,and li con- 1 nected by a cross-bore l3. This housing member is adjustably connected to the brake pedal by a connecting means comprising a rod 1 I l i threaded a into an integral extensionfll5 projecting rear wardly from the central part oIf the housingl0. A -nut l6 clamp'sthe rod and extension together. The other end of the rod ispivoted on the pin l1 .carriedby the brake pedal 9. i

Associated with thehousing member, "I aretwo.

sleeves 18mm; the sleeve it having jits rear bore 12 of the housing and end pressr-fitted into ,-the sleeve l9 having its rear end press-fittedinto bore ll of the housing.

portion of (the housing piston 4. Similarlikthe forward edgeoi the flat end 25 of the bar is adapted, to abut the end of apiston. rod 28 slidablytreceived 1n the sleeve l9 and oi suchlength as tovproject beyondthe mend of thesleeve andinto' the socket 29 of piston 5. A dust boot 3!! surrounds the two .sleeves and zis'attached'at'one end to the sleeves andat the other end to the rear-end of the two cylinders to -thus' totally enclose the piston rods, sleeves, and

the rear end of said cylinders. i

, In making the housing member ll'cross-bore I3 is formed'by boring completely through the housing, thus; forming the end openings 3| and 32. These openings permit the equalizing bar to be placed in its operative position so thatthe spherical central portion is in the cross-bore [3. After this bar is in position, sleeves l8 and Ware then press-fittedinto their bores l2- and l respectively. Since slots 20 and 2| inthe sleeves reen the-inner side ofsaid sleeves, the endsfof the sleeves will closethe openingsi'l and "when inserted in the bore. Thus, itis seen thatthe within whichthe equalizing bar is placed; is totally enclosed. This "perv mitsthe space around the equalizing bar to' =be fllledwith lubricant so as to 4li 'tion td 'the equalizing bar throughout'theiife of give proper lubricathe structure. It is also to be noted that' the whole assemblyflii'icluding the casing, equalizing bar, sleeves, andpiston rods form a single unit after assembly, which unit canbe quickly placed in operativeposition by? merely attaching the casing to rod H and placing the piston rods'in the sockets of the pistons";

tached to the unit before the pistonrods are The dust boot is atplacedin the pistonj'sockets.

The equalizing bar has a predetermined 8 which is positioned in thebore is prol'vided with aslot 20} Also, the insideoi theend the piston rods.

amount of free pivotal movement in the same place as that in which the piston rods lie. When pressure is applied to rod M by the brake pedal, it will be transferred by the equalizing bar to the piston rods and pistons to thus cause the pistons to be moved with equal force. If one of the fluid pressure systems served by one of the master cylinders should develop a leak so that it is no longer effective, the other master cylinder can continue to be operated with very little lost mo tion. For example, if line 6 should break, this will result in the equalizing bar having a clockwise rotation until the rear side of the end 25 thereof engages the housing; When this occurs, there will be a solid connection between rod [4 and piston rod 23 and then all the force applied by the pedal will b applied to piston 5 to develop pressure. Thus it is seen that the nnly lost pedal travel, when one master cylinder is inoperative,

is that determined by the distance betweenthe rear edge of end 25 and the housing which is quite small but, nevertheless, suificient to allowfor the equalizing bar to have sufficient pivotal movement to perform its equalizing action when both pistons are developing fluid pressure.

In Figure 2 there is shown a slightly modified structure. The housing I0 is provided with a cross-bore 33 which extends completely across the housing. The sleeves I8 and I9 only extend into their bores I 2' and I I as far as the juncture thereof with the cross-bor -33. bar 22' which is positioned within the bore 33 is provided with a spherical central portion 34 and also with spherical end portions and 36. The extension l5 to'which the rod I4 is connected, carriesv a threaded plug 3! which has an end portion extending into cross-bore 33, which end portion is provided with a concave surface 38 upon which bears th spherical central portion 34 of the equalizing bars. Also, the rear ends of piston rods 26' and 28 are provided, respectively, with concave end surfaces 39 and for engagement with spherical ends 35 and 36 of the equalizing bar. In order that bore 33 may be sealed after the equalizing baris placed therein and thus provide a chamber to hold a supply vof lubricant, the ends of said bore are closed by discs 4| and 42,

Theoperation of this modification is the same asthe structure shown inFigure 1. However, by employing plug 31 with the concave bearing surface 38, there is provided a greater bearing surface through which force may be transmitted. Since the plug is adjustable, any wear can be taken up. Also, by having the ends of equalizing bars 35 and 36 spherically shaped and the cooperating end surfaces of the piston rods provided with concave surfaces, a greater bearing surface is present between the equalizing bar and Being aware of the possibility of modifications in the particular structure herein described Without departing from the fundamental pricniples of my invention, I do not intend that its scope be limited except as set forth by the appended claims.

I Having fully described my invention, what I claim as new and desire to secure by Letters Patent of the Unitedstates is:

1. In apparatus of the class described, two

The equalizing 1 member, a piston rod in each sleeve, one of said piston rods having one end engaging one of said pistons and its other end extending into said housing chamber for engagement with one end of the equalizing .bar, the other ofsaid piston rods having one end engaging the other of said pistons and its other end extending into said housing chamber for engaging the other end of said equalizing bar, and means connected to the housing for moving said housing so as to transmit equal forces to the piston rods by means of said equalizing bar, said housing, sleeves and rods being so constructed and associated with each other as to totally enclose the equalizing bar.

2. In actuating apparatus of the class described for moving two members simultaneously with equal forces, a housing member having-a chamber, an equalizing bar mounted for limited pivotal movement in the chamber of said housing member, parallel piston rods one of which has an end extending into said chamber for engagement by one end of said equalizing bar and the other of which has an end extending intosaid chamber for engagement by the other end of the equalizing bar, the other ends of said piston rods being adapted for engagement with the two members to be moved, means for so closing said chamber as to permit lubricant to be retained therein, and means connected to the housing for moving said housing so as to transmit equal forces to the rods by means of said equalizing bar.

' 3. In actuating apparatus of the class described for moving two members simultaneously with equal forces, a housing member provided with a chamber, =an equalizing bar mounted in said chamber for limited pivotal movement, parallel guide sleeves each having one of its ends carried by said housing member and openin into the chamber adjacent an end of the equalizing bar, a rod slidably mounted in each sleeve, one of said rods having one end engaged by one end of the bar and its other end engaging one of the two members to be moved'and the other; rod having one end engaged by the other end of the bar and its other end engaging the other of the two members to be moved, and an actuating member connected to apply a moving force to the housing member on the side opposite the rods and sleeves.

4. In actuating apparatus of the class described for moving two members simultaneously with equal'forces, a housing member provided with a bore open at both ends, an equalizing bar mounted in said bore for limited pivotal movement, parallel guide sleeves positioned at right angles to the'axis of the bore and each having one of its ends carried by said housing member, and opening into the .bore adjacent an end of the equalizing bar, a rod slidably mounted in each sleeve, one of said rods havingone end engaged by one end of the bar and its other end engaging one of the two members to be moved and the other rod having one end engaged by the other end of the bar and its other end engaging the other of the two members to be moved, means for closing the ends of the bore to thereby enclose the equalizing bar and establish a lubricant chamber, and an actuating member connected to apply a moving pressure producing devices each coniprising a movable piston, a housing member having a chamber, an equilizing bar mounted for limited pivotal movement in the chamber member,

of said housing guide sleeves carried by said housing the rods and sleeves.

5. In actuating apparatus of the class described for moving two members simultaneously with equal forces, a housing member provided with a cros-bore open at both ends and two parallel 'bores entering the cross-bore at right angles to its axis end at opposite ends thereof, an equalizing bar mounted in said borefor limited pivotal movement, two guide sleeves each having one of its ends extending into one of said parallelbores scribed for moving two members simultaneously with equal forces, a member provided with a bore, an equalizing bar positioned in the bore and having acentral portion' provided with an annular curved surface adapted for abutment with a surface carried on the'housing and permitting limited pivotal movement relative to the housing, two rods each having one endextending into an end of the bore at right angles to its axis for engagement by an end of the bar, the other I end of the rod having engagement with the pmembers to be moved, guide means foreach rod ,carried by thehousing, andmeansflfor moving 'the housing and by, meansgofdth bar applying "equal forces through the rods ate the two memi bers.. i

7. In actuating apparatus oi the class described for moving two members simultaneously with equal forces, a housing member provided t with a chamber, an equalizing bar positioned in i said vchamber and having a central spherical portion and spherical end portions, means on the housing for providinga concave abutment surface for cooperationwith the central spherical surface of the bar, two rods each having an end extending into an end oftheechamber adjacent an end of the bar, each of said rods being provided with a concave surface for cooperation with the spherical surface on the adjacent housing and by means of the bar applying equal forces through the rods to the two members.

8. In actuating apparatus for twin masteroylinders having parallel cylinders and pistons reciprocable therein, a housing member, provided with a bore open at both ends, an equalizing bar mounted in said bore for limited pivotal movement, parallel guide sleeves positioned at right angles to the axis of the bore and each having one of its ends secured tosaid housing member and opening into the bore adjacent an end of the equalizing bar, a piston rod slidably mounted in each sleeve, one of, said rods having one end engaged by one endof the bar and the other end abutting one of the two pistons and the other rod having one .end engaged by the one end of the bar and its other end abutting the other piston, means for closingthe ends of the bore to thereby enclose the equalizing bar and establish a lubricant chamber, a dust excluding boot surrounding the sleeves and rods and having one end attached for movement with the, housing and its other end attached to, the end of the cylinders, and an actuating rod connected to the housingmember on'theside opposite the rods and sleeves.

9. A movable connecting meansfo r interposition as an assembled unit between an actuating memberand two members to be actuated, said connecting means, comprising a housing member provided with a chamber, an equalizing bar mounted in the chamber for limited pivotal movement, parallel guide sleeves carried .by the housing and extending from one side thereof, a rod in each guide sleeve, one end of each rod extending into the chamber for engagement with an end of the equalizing bar and having its :other end adapted for connection with one of n the two members to be actuated, and a rod'secured to the housing on the side opposite the sleeve and adapted for connection with the actuend of the bar, and means, for moving the a ating member. q

i STEVE SCHNELL. 

